Gives complete breakdown of entire Alka Sletzer experiment. http://www.howstuffworks.com/framed.htm?parent=question116.htm&url=http://www.stevespanglerscience.com/experiment/00000068
Discusses how Alka Seltzer works. http://science.howstuffworks.com/question116.htm
Discusses how baking powder works. http://www.howstuffworks.com/question57.htm